815 ILCS 405/2.5
"Retail installment transaction" means a credit sale of goods or a furnishing or rendering of services by a retail seller to a retail buyer for a deferred payment price payable in one or more installments pursuant to a retail installment contract or a retail charge agreement.
(from Ch. 121 1/2, par. 502.5)
(Source: P.A. 76-1780.)